Mathematics, 28.03.2020 19:09, madie0316

Please help me solve this:

If the selling price of 12 books and 21 pens are 240$, and the selling price of 21 books and 12 pens are 222$. What is the price of one book and one pen?

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Please help me solve this:

If the selling price of 12 books and 21 pens are 240$, and t...